Eureka, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Eureka, a city in Woodford County, Illinois.
Today
86°F
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
A chance of showers and thunderstorms before 11am, then a slight chance of showers and thunderstorms between 11am and 1pm. Mostly cloudy, with a high near 86. Southeast wind around 7 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Eureka
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 7 mph SE | 29% |
| Tonight | 68°F | Showers And Thunderstorms Likely | 6 mph WNW | 62% |
| Sunday | 74°F | Showers And Thunderstorms Likely | 5 to 15 mph N | 70% |
| Sunday Night | 57°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 16 mph NE | 56% |
| Monday | 65°F | Showers And Thunderstorms Likely | 17 mph ENE | 64% |
| Monday Night | 52°F | Chance Rain Showers | 12 to 17 mph NE | 46% |
| Tuesday | 64°F | Slight Chance Rain Showers | 15 mph NE | 19% |
| Tuesday Night | 50°F | Slight Chance Rain Showers then Partly Cloudy | 7 to 15 mph NNE | 15% |
| Wednesday | 67°F | Mostly Sunny | 12 mph NNE | 4% |
| Wednesday Night | 52°F | Partly Cloudy | 5 to 10 mph NNE | 2% |
| Thursday | 69°F | Mostly Sunny | 6 to 9 mph NNE | 2% |
| Thursday Night | 53°F | Partly Cloudy | 3 to 8 mph NE | 2% |
| Friday | 72°F | Mostly Sunny | 5 to 9 mph NE | 3% |
| Friday Night | 53°F | Partly Cloudy | 3 to 7 mph ENE | 3% |
Forecast source: National Weather Service (api.weather.gov) for Eureka (40.714, -89.277). Updated through the day.
Growing snapshot for Eureka
Last spring frost
Apr 21
First fall frost
Oct 17
Growing season
178 days
Hardiness zone
5b
More local growing data for Eureka: nearby ZIP 61530 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Benson
Carlock
Congerville
El Paso
Germantown Hills
Goodfield
Lowpoint
Metamora
Minonk
Panola
Roanoke
Secor
Washburn
Climate data from the nearest NOAA station, Congerville 2Nw, Il (6.2 mi from Eureka). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.